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Method for utilizing refinery acid gas

A sour gas and refinery technology, applied in the field of preparing dimethyl sulfide, can solve the problem of low conversion rate of methanol

Active Publication Date: 2021-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conversion rate of methanol obtained by this method is low

Method used

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  • Method for utilizing refinery acid gas

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This example is used to illustrate the method for preparing dimethyl sulfide by using refinery acid gas of the present invention.

[0042] Taking HZSM-5 as the active phase, kaolin as the carrier, and pseudoboehmite as the binding agent to prepare the catalyst, the silicon-aluminum ratio of HZSM-5 is 41.8, and the sodium oxide content is 0.02% by weight. The total amount of the catalyst is As a benchmark, the molecular sieve weight content is 80%. Add 200g of HZSM-5 molecular sieve into deionized water, ultrasonically disperse for 50min, then add 40g of pseudoboehmite and 10g of kaolin to the slurry, and continue ultrasonically dispersing for 30min. The mixed slurry was suction filtered, and the obtained filter cake was dried in a vacuum oven at a temperature of 45°C. Put the dried filter cake into extruder, knead with nitric acid aqueous solution to form a ball, and extrude to form. The catalyst is cylindrical with a diameter of 2mm. Place the molded catalyst in a re...

Embodiment 2

[0047] This example is used to illustrate the method for preparing dimethyl sulfide by using refinery acid gas of the present invention.

[0048]Taking HZSM-5 as the active phase, alumina as the carrier, and pseudo-boehmite as the binder to prepare the catalyst, the silicon-aluminum ratio of HZSM-5 is 31.7, and the sodium oxide content is 0.03% by weight, based on the total amount of the catalyst As a benchmark, the molecular sieve weight content is 70%. Add 200g of HZSM-5 molecular sieve into deionized water, ultrasonically disperse for 50min, then add 60g of pseudo-boehmite and 25.6g of alumina to the slurry, and continue ultrasonically dispersing for 30min. The mixed slurry was suction filtered, and the obtained filter cake was dried in a vacuum oven at a temperature of 40°C. Put the dried filter cake into extruder, knead with nitric acid aqueous solution to form a ball, and extrude to form. The catalyst is cylindrical with a diameter of 2mm. Put the molded catalyst in th...

Embodiment 3

[0053] This example is used to illustrate the method for preparing dimethyl sulfide by using refinery acid gas of the present invention.

[0054] With HZSM-5 as the active phase, pseudo-boehmite and alumina sol are used as the binding agent to prepare the catalyst, the silicon-aluminum ratio of HZSM-5 is 52.5, and the sodium oxide content is 0.02% by weight. Based on the total amount of the catalyst, Molecular sieve weight content is 90%. Add 200g of HZSM-5 molecular sieve into deionized water, ultrasonically disperse for 60 minutes, then add 20g of pseudo-boehmite to the slurry, and continue ultrasonically dispersing for 40 minutes. The mixed slurry was suction filtered, and the obtained filter cake was dried in a vacuum oven at a temperature of 40°C. Put the dried filter cake into extruder, add 11g of aluminum sol, knead with nitric acid aqueous solution to form a ball, and extrude into a rod. The catalyst is cylindrical with a diameter of 2mm. Place the molded catalyst in...

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Abstract

The method for utilizing the refinery acid gas comprises the following steps: contacting the refinery acid gas containing hydrogen sulfide with an acid medium, and then contacting with methanol in a reactor heated by molten salt in the presence of a catalyst containing an MFI structure molecular sieve to obtain a mixture containing dimethyl sulfide; and a step of when the methanol conversion rate is reduced to the condition 1 or the dimethyl sulfide selectivity is reduced to the condition 2, performing an operation of reducing the flow rate of the air flow passing through the molten salt until the methanol conversion rate is increased to satisfy the condition 3 and the dimethyl sulfide selectivity is increased to satisfy the condition 4. The method can solve the problem of excessive acid gas in a refinery plant, and has the characteristics of low operation cost and capability of effectively prolonging the one-way service life of the catalyst.

Description

technical field [0001] The invention relates to a method for utilizing refinery acid gas, more specifically the invention relates to a method for utilizing refinery acid gas and methanol to prepare dimethyl sulfide. Background technique [0002] Hydrogen sulfide is one of the most important sulfur resources in the world, mainly produced in natural gas desulfurization and petroleum processing. Refinery acid gas mainly comes from the processes of acid water stripping, dry gas desulfurization, liquefied gas desulfurization, and hydrogenation. Its main component is hydrogen sulfide, and it also contains a small amount of carbon dioxide, methane, ammonia, and water vapor. my country's demand for petroleum resources is growing rapidly, and it is necessary to import a large amount of high-sulfur crude oil. The heavy and inferior crude oil causes a large amount of refinery acid gas due to petroleum processing. Hydrogen sulfide gas in refinery acid gas is highly toxic, flammable and...

Claims

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Application Information

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IPC IPC(8): C07C319/14C07C321/14
CPCC07C319/14C07C321/14
Inventor 关莉莉汪颖慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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